Question # 1

Vrms =

Choose an answer

0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

In Pakistan the frequency of A.C. supply is.

Choose an answer

50 Hz

60 Hz

45 Hz

70 Hz

The peak value of A.C source is 20 A, then its rms value will be.

Choose an answer

14.1 A

10 A

20 A

28.2 A

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

Choose an answer

90^o

270^o

0^o

180^o

Impedance is denoted by:

Choose an answer

A

Z

P

Q

The effective value of any sinusoidal alternating current or voltage is

Choose an answer

None of the above

Direct current can not flow through.

Choose an answer

Inductor

Resistor

Transistor

Capacitor

Power dissipation in A.C circuit is expressed as:

Choose an answer

P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

Choose an answer

4 times

1/4 times

8 times

2 times

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

Choose an answer

50 Hz

25Hz

100 Hz

75 Hz

The unit of impedance is.

Choose an answer

Henry

Hertz

Ampere

Ohm

The main reason for world wide use of A.C is because:

Choose an answer

It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

The phase difference between the current and voltage at resonce is:

Choose an answer

0

π

-π

π/2

In purely resistive A.C circuit, instantaneous value of voltage and current:

Choose an answer

Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

The velocity of an oscillating charge as it moves to and fro along a wire is.

Choose an answer

Changing

Constant

Infinite

zero

A resistance frequency the impedance of RLC parallel circuit is.

Choose an answer

Zero

Infinite

Maximum

Minimum

Power dissipated in a pure inductor is.

Choose an answer

Large

Small

Infinite

Zero

The reactance of inductor depends upon

Choose an answer

L

All of the above

More Classes

Other Links

Physics FSC Part 2 Chapter 16 Online MCQ's Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer